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    <title>宽度自适应模式</title>
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<body>
<div class="wrapper">
    <div class="header">
        <h1>宽度自适应</h1>
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    <div class="main">
        <div class="sidder">
            <p>列宽250px</p>
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        <div class="content">
            自适应
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    </div>
    <div class="fotter">
        <address>
            页脚信息
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